wimlib

What command should I use to backup live system?
1.
D:\wimlib>wimcapture.cmd C: d:\dyskc2.wim --compress=fast --config=conf.ini --threads=8 --snapshot --boot
Scanning "C:"
6992 MiB scanned (19311 files, 2466 directories)
Using XPRESS compression with 8 threads
Archiving file data: 6438 MiB of 6438 ...